<h2 class="group_name">Alert</h2>
<h2 class="how_use">How to use</h2>
<div class="use_content">
  <pre>alerts_msg = {msg:'alert message',close:true}</pre>
</div>
<h2 class="demo">Demo</h2>
<div class="alert_demo">
  <button class="add_alert">add alert</button>
  <input type="checkbox" name="alert_checkbox" class="alert_checkbox">close alert
</div>